Gone are the days of using one phone number for each mobile device you use as wireless carriers are starting to allow their subscribers to use a single phone number for multiple handsets. AT&T was the first to take the step towards this revolution, introducing NumberSync (expected to become live on its first device in the upcoming holiday season), which basically allows the wireless carrier’s subscribers to apply their primary phone number to additional mobile devices, including tablets and even wearable devices such as smartwatches.

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